LIST OF ILLUSTRATIONS xi 



FIG. PAGE 



795. Development of eye ... . 109 



796. Muscles and nerves of eye . .110 



797. Pineal eye of Sphenodon . ... .111 



798. Organ of hearing .... . .112 



799. Section of ampulla ... .112 



800. Urinary tubule . ... .114 



801. Diagrams of urinogenital organs . .115 



802. Development of mesoderm in Frog . .117 



803. Petromyzon fluviatilis, external views of head . . 120 



804. marinus , skull, with branchial basket . .121 



805. 122 



806. ,, ,, dissection of female . . . 125 



807. brain . . .127 



808. ,, with olfactory and pituitary sacs . 128 



809. ,, ,, development of olfactory and pituitary sacs . 129 



810. ,. auditory organ 130 



811. ,, .. transverse section of trunk .... 130 



812. ,, ,, urinogenital sinus and related parts . . 131 



813. ,, development . . . 131 



814. ,, sections of embryos . . . . 132 



815. ,, fluviatilis, head of larva . .... 133 



816. Head of Myxine and of Bdellostoma . .135 



817. Myxine glutinosa, dissection . . . .136 



818. auditory organ . . .137 



819. Bdellostoma, kidney . .137 



820. Palseospondylus gunni . .138 



821. Hemiscyllium modestum . . .... 141 



822. Scyllium canicula, vertebrae . . . .142 



823. Hemiscyllium, skull . . 143 



824. ,, visceral arches .... 146 



825. ,, pectoral arch and fin . ... 147 



826. ,, pelvic arch and fin 147 



827. ,, lateral dissection . . 148 



828. ,, branchial sac ... 149 



829. Scyllium, heart and branchial arteries . . .150 



830. Hemiscyllium, blood-vessels . . . .152 



831. Scyllium canicula, brain . . .154 



832. Hemiscyllium, brain . . 155 



833. Syc Ilium catulus, cranial nerves and branchial plexus . . .156 



834. ,, canicula, cerebral nerves 157 



835. ,, urinogenital organs . . . . . .160 



836. Hemiscyllium, right kidney and urinary sinus 161 



837. Dogfish, egg-case .161 



838. Cladoselache fyleri ... . . 162 



839. Pleuracanthus ducheni ... 163 



840. Acanthodes wardi ... . .... 164 



841. Chlamydoselachus angumeus 164 



842. Lamna cornubica . . .165 



